Add api needed files
new file:   en/documentation/api/authentication.md
new file:   en/documentation/api/create_your_own_controller.md
new file:   en/documentation/api/routes/attributeav.md
new file:   en/documentation/api/routes/customer.md
new file:   en/documentation/api/routes/image.md
new file:   en/documentation/api/routes/product.md
new file:   en/documentation/api/routes/product_sale_elements.md
new file:   en/documentation/api/routes/tax_rule.md
new file:   en/documentation/api/routes/title.md
Add sidebar and "title" doc
	modified:   _config.yml
	new file:   _layouts/api.html
	modified:   en/documentation/api/create_your_own_controller.md
	renamed:    en/documentation/api/routes/image.md -> en/documentation/api/routes/product_image.md
	modified:   en/documentation/api/routes/title.md
Complete customer title and tax rules
Add readonly routes
Add customer controller doc
Many fixes
Finish routes
add controller page
finish API doc
Add warning with ssl
Code review
Merge pull request #91 from lovenunu/api

Api